ICD-10 Code M06.09 – Rheumatoid arthritis without rheumatoid factor, multiple sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M06.09 – Rheumatoid arthritis without rheumatoid factor, multiple sites
What it is
This code identifies rheumatoid arthritis affecting more than one joint when rheumatoid factor is not documented as present. Use it for seronegative rheumatoid arthritis involving multiple sites.
Clinical signs
Typical findings include persistent inflammatory joint pain, swelling, stiffness, and reduced range of motion in multiple joints. Clinical features vary; refer to documentation.
When to use this code
Use M06.09 when the provider documents rheumatoid arthritis without rheumatoid factor and specifies involvement of multiple sites. It fits cases where the diagnosis is confirmed clinically and the record supports seronegative disease. Do not infer “multiple sites” unless the documentation clearly states more than one joint or site.
Do not use for
Do not use this code if rheumatoid factor is documented as positive, or if the chart does not support rheumatoid arthritis. Check documentation when the site count or serologic status is unclear.
Coding tip
Verify both the seronegative status and the multiple-site detail before assigning M06.09.